Maintenance &

Troubleshooting Guide

Ultra

®

NX

Frozen Beverage Dispenser

PROBLEM

Blank LCD display screen

Possible Cause / Remedy

Power cord may be disconnected. Also, press main power switch to the ON position.

Left (or Right) side auger not turning

Left (or Right) side not freezing

Press left (or right) uager toggle switch to start. (Power must be ON).

1) Left (Right) side auger must be turning.

2) Press left (or right) ice control switch until the display reads “ICE”.

3) Adjust product thickness (See “How-to” box below or the manual).

Product is very slow to freeze

Lamps in top covers are out

1) Check that rear of machine has a 4-inch minimum air clearance.

2) Clean rear screen with soapy water or compressed air.

3) Deflect away any warm air from nearby equipment.

Check that tops are plugged into base of unit.

If the suggested remedy does not solve the problem, call for help or service.

HOW TO

Access Cleaning Guide on LCD Display

Adjust Product Thickness

(This feature may be password protected)

Display Temperature & Torque readings

• Activate/change night time thaw mode

• Activate/change cleaning schedule

• Change Date and Time

Steps

Press and hold the Center Dot switch for 5 seconds. When “Cleaning Guide” is displayed, press the Right Dot switch to select YES. Then select the Center Dot switch to step through the 9 instructional screen displays.

Press and hold the Center Dot switch for 5 seconds. When “Cleaning Guide” is displayed, press the Left Dot switch to select NO. The screen will then display “Set Thickness?” Select YES (the Right Dot switch) to display thickness scale for the LEFT hopper. Move the scale up or down using the Left Dot and Right Dot switches

(minimum is 1; maximum is 16). Then press the Center Dot switch to display thickness setting for the RIGHT hopper. Adjust as necessary. Display will time-out and return to home screen after 60 seconds.

This provides valuable information to a technician and helps to determine whether a problem is in the refrigeration system or mechanical in nature. Simultaneously press and hold the Left Dot and Right Dot switches for 5 seconds. The top number displayed is the auger torque reading for each cooling drum.

The bottom number toggles between the cooling drum temperature and the hot gas temperature. Record all three numbers for each drum before calling for service. Simultaneously press and release the Left Dot and Right Dot switches to return to the home screen.

See “Programming the Dispenser” in the equipment Operating and Service Manual.

These features may be password protected.

Clean REAR Filter Screen

Pull Left and Right tab out to remove screen.

Clean with soapy water or compressed air and re-install the screen.

Left Side

MAIN POWER

ON/OFF SWITCH

I

O

Right Side

LCD DISPLAY SCREEN

LEFT DOT SWITCH RIGHT DOT SWITCH

AUGER ON SWITCH

AUGER OFF SWITCH

AUGER REFILL ON

ICE CONTROL SWITCH

(Toggles to OFF, ICE, CHILL, DEFROST)

ICE CONTROL SWITCH

(Toggle to OFF, ICE, CHILL, DEFROST)

CENTER DOT

SWITCH AUGER ON SWITCH

AUGER OFF SWITCH

AUGER REFILL ON

WARNINGS & ERROR MESSAGES

NIGHT MODE

CLEAN DUE TODAY

CLEAN DUE NOW

MONTHLY FILTER CLEAN REQUIRED

FILTER NEEDS CLEANING

Interpretation / Action To Take

It is recommended that the product in the dispenser be thawed each day, usually overnight. The ice granules get too large and a consistent product is difficult to maintain if left frozen too long. The machine will automatically return to normal freeze mode at the programmed time. To change this setting, check the Operating & Service Manual.

Follow cleaning procedure on the Cleaning Card or access the one on the display window.

(See Access Cleaning Guide on LCD Screen in “How to” section above)

See above. You must clean for the LCD display to clear.

Clean rear screen with soapy water or compressed air. Press Left Dot button and hold for 3 seconds to clear screen.

Compressor is overheating and will shut down. Clean rear screen and be sure rear of machine has a minimum

4-inch air clearance.

Compressor is running too hot. Service is required.

A reminder that a 12-month Preventive Maintenance is recommended. See Operating manual for further instructions.

!! FILTER NEEDS CLEANING !!

SHAFT SEAL MAINTENANCE DUE

LEFT/RIGHT TEMPERATURE SENSOR

SHORTED/OPEN

• Left/Right Torque Sensor Shorted/Open

• Hot Gas Thermistor Shorted/Open

LEFT/RIGHT REFILL ERROR

(Hopper Lights Flashing)

CHECK RIGHT/LEFT SIDE PRODUCT MIX

OR DRIVE SYSTEM

DEFROST - LEFT/RIGHT BARREL(S) IN

PROCESS OF DEFROSTING

Add product to minimum fill line. If warning continues, follow instructions below.

Record Temperature & Torque numbers (see “How to” section above).

Call for service and provide these numbers to the technician.

Press Left Dot button for 3 seconds to clear.

Product thickness not correct. Check product ratio/brix. And/or refill hopper if low.

This will go back to normal operation after defrost is complete.

HOPPER LIGHTS FLASHING

Hopper is low on product. Refill hopper to clear error.

If unit has Autofill; product BIB may be empty. Replace if needed.

Bunn-O-Matic Corporation

| Post Office Box 3227 | Springfield, Illinois 62708-3227 | Phone (217) 529-6601 | Fax (217) 529-6644

58028.0000 B 2/22 © 2021 Bunn-O-Matic Corporation

Side 1 www.bunn.com

Use & Care Guide

Ultra

®

NX

Frozen Beverage Dispenser

NOTICE: This guide is for quick reference only and is not intended to replace the information in the Operation Manual.

DISASSEMBLY & CLEANING

I

O

1 2 3 4

SEP. 5, 2021 off off

1. Turn cooling to OFF selection.

Empty all product from the

Hoppers. Turn Auger to

OFF selection.

5

2. Disconnect the Hopper Lid

Cords on the back of the

Hoppers.

6

3. Disconnect the Level

Probes at the top rear of the Hoppers.

7 a b

4. Remove Hopper Lids.

8

NOTE: If it’s an Autofill unit; disconnect the Fill Hoses from the back of the Hoppers also.

9

5. Remove the Faucet

Assembly.

CAUTION: The Faucet

Valve is under Spring tension. Use tab on left side of the Handle to pull off Pivot Pin.

10

6. Removing Handles a. While slightly twisting the Handle, pull the left side off the left

Pivot Pin.

b. Then spread Handle on right side to remove from right Pivot Pin.

Seal

7. Carefully slide the Faucet

Valve up to remove the

Spring and Faucet Seal.

NOTE: Extra care should be taken when handling the seal to prevent damage.

Do not fold the seal as this will cause damage to the

Teflon ® sealing surface.

11

8. Depress the Hopper Lock

Plunger and lift the Hopper up slightly.

12

9. Pull Hopper forward to remove.

13

10. Remove Auger Nose

Bushing from inside the

Hopper.

NOTE: Care must be taken to ensure this surface does not get scratched during cleaning.

Deep scratches could cause leakage around the Seal.

11. Remove the Seal from the back of the Hopper.

12. Pull Auger from Cooling

Drum.

13. Pull Grommet from

Cooling Drum.

14. Wash all parts in a clean sink with mild soap and hot water (120°F). Place all parts in a clean sink with Sanitizer Solution in 120˚F (48.9˚C) water. Allow all parts to soak for at least 5 minutes. Carefully wash all components with a clean wash cloth in the hot water and Sanitizer Solution. Use a clean, soft, bristle brush as needed for the smaller components and tight areas. NOTE: Do not immerse Hopper Lids and use a commercial sanitizer.

15. Wash the Cooling Drums, Hoppers, Drip Trays, Top Covers, and outer enclosure using a clean wash cloth that has been soaked in the warm water and

Sanitizer Solution. NOTE: Pay attention to the shaft area and make sure it is thoroughly cleaned and sanitized.

16. Thoroughly rinse all surfaces with a clean wash cloth that has been dampened with hot water. Wipe dry with a clean, dry wash cloth before reassembling the dispenser. NOTE: Although most parts are dishwasher safe, they may be affected by the chemicals in some commercial sanitizing agents. Do not place the

Hopper or Hopper Lids in a dishwasher. Rinse thoroughly before assembly.

ASSEMBLY AFTER CLEANING

1 2 3 4 5 6 7 8 9

1. Apply provided lubricant to

Grommets on side facing

Cooling Drum.

2. Install Grommets on the ends of the Cooling Drums.

3. Align the Auger Shaft with the Flat Fin of the Auger.

4. Push Augers onto Cooling

Drum and rotate until the Flat

Fins are flush inside Auger.

5. Install Auger Nose Bushing into interior slots.

6. Install a Hopper Seal over the back of each hopper.

7. Install Hoppers over the

Augers and Cooling Drums.

8. Slide the Hoppers into place and push down.

9. The Hoppers are seated when the Lock Plunger snaps into place and sticks out.

10 11 12 13 14 15 16 17 18

I

O

SEP. 5, 2021

ICE off

10. Place Spring and Seal in

Faucet Valve.

11. Carefully slide Faucet

Valve Assembly into place on the Hopper.

12. Install a Handle by starting the right side over the right

Pivot Pin.

13. While slightly twisting the

Handle, spread the left side over the left Pivot Pin to snap into place.

14. Install Level Probes at the top rear of the Hoppers.

15. Set Lids on the Hoppers.

NOTE: If this is an Autofill unit, slide the Hopper Fitting into place in the slot on the Hopper.

16. Attach each of the Hopper

Lid Cords on the back of the Hoppers.

17. Assemble Drip Tray and slide onto metal extensions from base.

18. Turn ON augers and cooling function to desired settings.

NOTE: Whether liquid concentrate or granulated powder, all product must be thoroughly mixed BEFORE adding it to the hoppers.

58028.0000 B 2/22 © 2021 Bunn-O-Matic Corporation

Side 2 www.bunn.com